A “megacity” is a metropolis of 10 million souls or more. Back in 1950, the world had exactly two: Tokyo and New York. As of 2010, the world had 23 megacities, with 12 of them located in Asia. By 2025, according to the U.N., that number may rise to 37, with 21 of them being in Asia. How are countries like China and India adjusting to such an epic migration? […]